US1919420A

US1919420A - Cutting tool

Info

Publication number: US1919420A
Application number: US615001A
Authority: US
Inventors: William E Edwards
Original assignee: National Tube Co
Current assignee: National Tube Co
Priority date: 1932-06-02
Filing date: 1932-06-02
Publication date: 1933-07-25
Anticipated expiration: 1950-07-25

Description

July 25, 1933. w. E. EDWARDS CUTTING TOOL Filed June 2, 1932 3 Sheets-Sheet 1 MAL/4M 5. [an 4e05,

' fi/ Wornez/s July 25, 1933.

W. E. EDWARDS CUTTING TOOL File June 2, 1932 3 Sheets-Sheet 2 [wen/Z09:

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y 1933- w. E. EDWARDS CUTTING TOOL Filed June 2, 1932 9- /4 5 Y [8% 4 5 ZZ/QQ 3 Sheets-Sheet 3 liweni'or:

7 39 having a flange 2 at its top by which it may Patented July 25, 1933 airs stares WILLIAM E. EDWARDS, or rrrrsnunen, rnnnsrfizwmranssrenon .TU'BE COMPANY, A CORPORATION or new JnnsnY tries to NATIONAL curative r001;

This invention relates to taps which cut tapering threads in pipe couplings and the like, although it also includes features which are applicable to other types of rotary cutting tools.

It particularly relates to a'tap intended to cut oppositely tapering threads in pipe couplings when given a single pass theret-hrough, one of the objects being to provide a. tool which does this automatically. Another object is to construct this tool with a plurality of radiating cutting segments which are easily collapsed after threading an article, so that the tool may be easily withdrawn therefrom. Other obj ects will be understood from the following.

Having reference to the accompanying drawings which illustrate a specific form of a tool constructed in accordance with the. present invention:

Figure 1 is a side elevation.

Figure 2 is a. cross-section of Figure 1.

Figure 3 is a cross-section from the line III1II of Figure 2. Figure 4 is the same as Figure 2 except that the drawings are in different positions.

Figure 5 is a. cross-section from the line VV of Figure 1.

These drawings show an elongated body 1 be securely bolted to the spindle 3 of a tapping machine. This body has a longitudinal bore 4 whose upper section 5 is enlarged. Farther down it has two levels of radially arranged spaced slots 6. Its mid section is provided with a lreyway 7 A sleeve 8 is slidably arranged in the bores enlarged section 5 and is held against turning movement by a pin 9 which projects through a slot 10 in the body 1. The upper portion of this slot is enlarged so that the pin may be swung when the sleeve 8 is raised slightly. This sleeve is provided with a longitudinal groove 11 registering with an adjustable bleeder valve 12 which thus communicates with the enlarged portion 5 of the bore 4 and with the inside of the sleeve 8.

A plunger 13 is arranged with its head in the sleeve 8, which has a flange 14 preventing separation of the two, and carries a key 15 1932. Serial No. 15,001.

having an upstanding lug portion 16. The flange 14 is-grooved so that this key 15 can slide therein and rotatively interlock the sleeve 8 and the plunger 13. The lug 16 of the key 15 slides in the lreyway 7 until it reaches the enlarged section 5 of the bore 4:. When there, the sleeve 8 and the plunger 13 may be turned by the pin 9 within the limits of the enlarged portion of the slot 10.

A rod 1'? is suspended from the shank of the plunger 13 and carries a pair ofcams 18 and 1 9, the first mentioned having a slot 18 rethecutting of the second taper while the upper se ments are still cutting the first. This feature materially speeds coupling tapping work'. V v

Specifically, the cam 18 is constructed with a number of spaced fingers which'register with the upper level of slots 6 and have de clined surfaces which contact the segments projecting therethrough. The cam 19 also has a number of fingers which register with the lower level of the slots and have inclining surfaces which contact the segments in this level. The fingerso-f these two cams are mtermeshed and are in each instance constructed with recesses 21 arranged to receive the segments upon" slight turning movement.

This turning movement may be effected when the rod 1'? is in its uppermost position because the lug 16 of the key 15 then engages the bottom of the sleeve 8 and lifts it upwardly so that the pin 9 may be turned into the enlarged portion of the slot 10. When this is done the lug 16 will have left the keyway 7' and will be in the enlarged section 5 of the bored resting on the shoulder at its bottom, and thus holding up the sleeve 8. e i

,VVhen the pin 9 is moved into registration with the small portionof the slot 10 it will move the lug 16 into registration with the keyway 7 and allow all the inside members of the tap to drop into operative position, the suction in the enlarged portion preventing any destructive shock. This suction may, of course, be varied by adjustment of the bleeder valve 12.

An oil reservoir 22 is arranged above the two levels of segments 20 and has ducts 22 which lead to points adjacently above each of the cutting segments. When this reservoir is filled with oil it is possible to properly lubricate the cutting segments.

In order to vary the tapering cuts of the different segment levels the cam 18 is fixed to a sleeve 23 which projects downwardly through the cam '19 and is vertically adj ustable by a nut 24. A nut 25, which is threaded on this sleeve, serves to adjust the cam 19. By this arrangement both cams relative positions may be varied so that properly tapered threads are cut.

Before threading operation, the various parts in the bore of the body 1 are in their uppermost positions. As the tool is lowered into the article to be tapped the pin 9 is disengaged from the enlarged portion of the slot so that the various inside part-s drop down wardly into operating position. These parts drop gently because of the cushioning effect of the plunger 13. As the tool enters the work the lower end of the rod 17 encounters stop 26 and is held against further longitudinal movementthereby.

The segments have tapered cutting leads on their bottom portions and the article being threaded will naturally tend to thrust the lower level of these back into. the recesses. The segments in the upper level are held outwardly by the cam 18 and commences to cut the threads. As the body 1 moves downwardly this upper level of segments will gradually collapse because of the shape of the cam 18, springs 27 tending to make this action more positive. As the lower level of the segments approaches the mid point of the article being threaded the cam 19 begins to force them outwardly. Atthe same time the upper level of the segments have receded from their cutting positions. When the cutting segments have accomplished their purpose the various parts inside the body 1 will again be at their uppermost position so that the pin 9 may be manually turned and lock the entire assembly in place.

Although a specific form of this invention has been shown and described in accordance with the patent statutes, it is not intended to limit'its scope exactly thereto, except as defined by the following claims.

I claim:

1. A tool including 'a vertical elongated body having a longitudinal bore and radial slots opening thereinto, cutting se ments radially movably arranged in said slots, a

a cam on said rod constructed with surfaces whichcontact and radially move said seg: ments when moved longitudinally and with recesses which receive these segments when turned, and means for preventing respective rotation of said cam and said sleeve and for raising the latter when said plunger is moved upwardly.

2. A tool including a vertical elongated body having a longitudinal bore and two levels of radially arranged spaced slots opening thereinto, cutting segments radially movably arranged in said slots, a sleeve arranged in the upper portion ofsaid bore for limited vertical and turning movement, means for holding said sleeve against turning movement when at its lower position, a plunger fitting said sleeve, means for preventing said plunger dropping from said sleeve, a rod de pending from said plunger, cams on said rod constructed with surfaces which contact and radially oppositely move the respective levels of said segments whenmoved longitudinally and with recesses which receive these segmentswhen turned, and means for preventing respective rotation of said cams and said sleeve and for raisingthe latter when said plunger moves upwardly.

3. A tool comprising av vertical elongated body constructed with a longitudinal bore having an enlarged upper section and with two levels of radially arranged spaced slots in its lower portion opening into the. lower section of this bore, cutting segments radially movably arranged through said slots, a sleeve slidably arranged in the enlarged section of said bore, a plunger fitting said sleeve, means for preventing said plunger dropping from said sleeve, a rod depending from said plunger, cams on said rod constructed with surfaces which contact and radially oppositely move the respective levels of said segments when moved longitudinally and with recesses which receive these segments when turned, means for interlocking said cams, plunger and sleeve against turning movement in said bore except when they are'at their uppermost positions in the latter and constructed to lock the same against vertical movement when turned, and means for turning said sleeve.

1. A tool including a vertical elongated bis ito

body having a longitudinal bore and two levels ofradiating spaced slots opening thereinto, cutting segments arranged in said slots for radial movement respecting said body, a rod arranged in the bore offsaid body for limited vertical movement and so its lower end projects therefrom whenit is in its lowergaging said first named cam member, a nut screw-threaded on sa d rod and engaglng said sleeve, and another nut screw-threaded. on said sleeve and. engaging SELld second named cam member.

WILLIAM E. EDWARDS,